Abstract
The high viscosity of lubricating oil limits the working speed of sliding bearing, and the viscosity of bubbly oil is less than that of lubricating oil at high shear rate. The viscosity of bubbly oil is related to bubble size distribution. An experimental device for generating microbubbles in bubbly oil is designed, and a method for measuring bubble size distribution in bubbly oil with different aeration levels is proposed based on digital imaging technology. The experimental results show that the size distribution of bubbles accords with lognormal distribution basically, and the higher the air volume fraction is, the larger the average diameter of bubbles is.
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